/*
* Copyright (C) 2012-2013 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.jdbc.internal.airlift.http.client.netty.socks;
import com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer;
import com.facebook.presto.jdbc.internal.netty.channel.ChannelHandlerContext;
import com.facebook.presto.jdbc.internal.netty.channel.ChannelPipeline;
import com.facebook.presto.jdbc.internal.netty.channel.ChannelPipelineFactory;
import com.facebook.presto.jdbc.internal.netty.channel.ExceptionEvent;
import com.facebook.presto.jdbc.internal.netty.channel.MessageEvent;
import com.facebook.presto.jdbc.internal.netty.channel.SimpleChannelHandler;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
/**
* This handshake handler swap out the channel pipeline with the delegate
* upon handshake completion.
*/
public class Socks4HandshakeHandler
extends SimpleChannelHandler
{
private final SettableChannelFuture channelFuture = new SettableChannelFuture();
private final ChannelPipelineFactory delegate;
public Socks4HandshakeHandler(ChannelPipelineFactory delegate)
{
this.delegate = delegate;
}
public SettableChannelFuture getChannelFuture()
{
return channelFuture;
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
throws Exception
{
channelFuture.setChannel(ctx.getChannel());
if (e.getMessage() instanceof ChannelBuffer) {
ChannelBuffer msg = (ChannelBuffer) e.getMessage();
if (msg.readableBytes() < 8) {
channelFuture.setFailure(new IOException("invalid sock server reply length = " + msg.readableBytes()));
}
// ignore
msg.readByte();
int status = msg.readByte();
int port = msg.readShort();
byte[] addr = new byte[4];
msg.readBytes(addr);
ctx.getChannel().setAttachment(new InetSocketAddress(InetAddress.getByAddress(addr), port));
if (status == SocksProtocols.REQUEST_GRANTED) {
ctx.getPipeline().remove(Socks4ClientBootstrap.FRAME_DECODER);
ctx.getPipeline().remove(Socks4ClientBootstrap.HANDSHAKE);
ChannelPipeline delegatePipeline = delegate.getPipeline();
for (String name : delegatePipeline.getNames()) {
ctx.getPipeline().addLast(name, delegatePipeline.get(name));
}
channelFuture.setSuccess();
}
else {
channelFuture.setFailure(new IOException("sock server reply failure code :" + Integer.toHexString(status)));
}
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
throws Exception
{
channelFuture.setChannel(ctx.getChannel());
channelFuture.setFailure(e.getCause());
}
}